Calipers.



N. HBLWIG;

GALIPBRS 'APPLICATION FILED DEO, 14,. 1911.

famme@ Aug. 6,1912.

' NICHOLAS HELWIG, or MDDLErOWN, OHIO.

OALIPERS.

'Specification Of Letters Patent. I

Patented Aug". o, 1912.

Application tiled December 14, 1911. Serial No. 655,767.

To all jwhdm 'it may concern: i

- -Be it known that I, NICHOLAS HBLWIG, a citizen of the United States, residing at Middletown, in the county of Butler and State of Ohio, have invented certain new and iuseful Improvements 1n Cal1pers,of

which the following is a specification.

This invention relates to that vtype of calipers known.-as beam calipers, and its Object is to rovidea-n instrument of this kind which 1s capable. ofine adjustment, and whichmay also be arranged so as to be put to various uses.

Y :With these objects in view, t-he invention consists 1n arnovel construction and arrange- A ment of parts Ato be hereinafter described and claimed, reference being had to the ac-v companying drawing forming a part of this specification, in which drawing-- -Flgure 1 is a side elevation of the instruof; Fig. 3A is a cross-section on the line 3-3 of Fig. 1; Fig. 4 is an elevation showing a lmodification; Fig. 5 is a horizontal section on'the line 5 5 of Fig. 4; Fig. 6 is a plan View of the bea-m of the instrument.

Referring specifically to the drawing, 10

denotesthe beam of the instrument,'th`e same.

comprising a straight barwhich is partly circular in cross-section, the top being iiat. Throughout the major portion of its length,

. the top of the beam is provided with transverse graduations l1, and central recesses12 which are intersected by.said graduations. The rear end of the beam is screwthreaded as indicated at 13.

On the graduated portion of the beam is I slidably mounted a block 14 having affsocket 15vtO receive one of the caliper legs 16, said leg being. removably clamped in the socket by a set screw 17. That portion ofthe leg which seats in the socket has diametrically opposite recesses 18 to receive the point of the set screw. The leg may be reversed by giving it a half turn after unscrewing the set screw. The block 14 is clamped in ad- `justed position on the beam 10 by means of a set screw 29, the point of which is adaptl inthe desired position on the latter, it is securely clamped thereto by operating the set screw in an Obvious' manner. The other caliper leg is indicated-at This leg is carrled by a sleeve 31 having a.' socket 32 in which' the leg is clamped in the same manner as the leg l16. u

Inasmuch asbOt-h legs of the instrument are reversible, they may be setto caliper inside land outside; and as' they are also removabl eboth legs may be removed and divider p/oints put in place thereof, if the iny strument is to be used as a divider; or one leg may be removed and one remain, ifit is desired to use the instrument as a hermaphrodite caliper. '-1

The sleeve 3l is carried by' a nut 33 which is threaded to screw onthe threaded end 13 of the beam 10. The forward end of the nut is enlarged in diameter as indicated at 34, which vproduces a. shoulder-'35,y between which latter and an abutment'36, the sleeve 1s mounted. The abutment is a nut which screws on t-he rear end of the nut 33,

' said end being externally screw-threaded for tional parts of an inch or other unit of measurement. On the outer end of the collar 37 is an index mark 40 which cooperates with the graduations 39, the latterV being numberedsaid numbers being located on the Out-er surface vof the 'part- 34bel1ind the bevel 38. f g

It will be evident from the foregoing that when the nut is rotated it is caused/to travel on the threaded end 13 of the beam 10, thereby carryingr the leg 30 toward or from the legr 16, according to the direction the nut is made to travel. The beam has twentv threads Ato the inch, and the scale formed by the graduations 39 has fifty subdivisions, so that if the nut is rotated a distanceequal to one subdivision of the scale, it will travel a' distance `of one thousandt-h part ot an inch. -The instrumentis therefore capable of a very fine adjustment.

In order to lock the nut 33 in adjusted position, there is provided a lock nut 41 which screws on the threaded end 13 of the bea:

' `Figs. 4 and 5 show the instrumentarra ed as a surface gage. In-this structure 2the .10 is held vertically by a set screw 43 in a hub 44 formed on a hollow stand or rbavse45, and the parts-which are mounted on v' thethreaded portion 'of the beam in the I claim:

y 1. A 'caliper comprising first-described structure carry a pointer 46.

y dna-ted beam havi afscreW-threaded portion, a'blo'ck adjustab ynounted on the graduatedv o rtion of the .beairn4 a caliper leg carried y the It blockya circular nut mounted on the threadl ed portion of the beam and having a circular series of graduations, a sleeve mounted on the nutumeans for holding the sleeve against longltudinal movement 'on the nut; a

l caliper leg vcarried by the sleeve, anda fixed I collarv on the'be'am, saidl collar hav' l Q dexj-mark 'operatng with the a' circular series of graduations.

oresaid f'fff' 2. A'calipercomprislng a graduated beam Ahavilfx'g a screw-threaded port1on,a block ad "justably' mounted 'on the graduated portion of thebeam, a caliperleg'carried by the block, a circular nutmon'nted on the threaded portion of thel beam and having an enanin-V the aforesaid circular series of *justably mounted on the graduated lio of the beam, a caliper leg carried y lcaliper leg carried "by-k the{s'leeve.

in'x .presence of two witnesses.4

Witnesses:

.` W. M. Born,

CEAS. GRAY.-

largementat one end't'o produce a shoulder,' an abutmenton the n'ut, a-sleeve mounted on l thenut between the lshoulder and the abutment, said nut having a circular series of graduations, a caliper leg carried by the sleeve, and a fixed collar on the'b'eam, said collar having anindex mark coperatingwith aduatio'ns. f 3. A` hcaliper'comprising a gra ua'ted beam lhaving a screw-threaded portion, a block vadrtion the block,V affixed collar'on the beam, said collar having an .index mark, a circular nut mounted on thethreaded'portion of the beam, one end of the nut beinghollow and fitting over the aforesaid collar, said end of the nut hav'- ing a bevel which extends to the collar, and said bevel having a circular series of gradu ations with )which the index 'mark ofthe collar coperates, aTsleevev mounted on'the nut, means for' holding the sleeve against longitudinal movement-on the nut, and a' NICHOLAS HELY'VIG.'

i Intestimony whereof I aiix. my signature 55 l l a l 

